12 
Journal of Mycology 
[Vol. 10 
water in the laboratory in lieu of a potted plant, gave some 
spermogonia, but the leaf fell from the stem before the time for 
the appearance of the aecidia. It would have undoubtedly been 
a successful infection, had the conditions been favorable for 
maintaining the vigor of the host. This species is based upon 
cultures made by the writer 7 in 1901. Its exact standing is yet 
in some uncertainty, and probably can not be settled until the 
connection of the very common aecidium, or aecidia if more than 
one kind, on the several species of Ribes is ascertained. Dr. J. 
J. Davis 8 9 has expressed the opinion that the whiteness of the 
aecidial cups is probably due to the conditions under which they 
are grown, and that they are normally orange-colored and iden¬ 
tical with the common form. But the facts can only be ascer¬ 
tained by cultural studies. 
5. Puccinia Helianthi Schw.—Ample teleutosporic ma¬ 
terial was available in vigorous germinating condition, collected 
by Prof .W. A. Kellerman at Sandusky, Ohio, and by the writer at 
Fair Oaks, Ind. All of it was on Helianthus mollis. Sowings 
began on April 29, and continued at intervals until June 2, 
twenty cultures being attempted. The sowings on H. strumosus, 
H. tuberosus, H. grosse-serratus, H. rigidus, and H. Maxi- 
miliani gave no infection. The sowing on H. tomentosus gave 
a slight infection, a few spermogonia appearing but reaching no 
further development, although the leaves were young and the 
plants exceptionally vigorous. On H. mollis and H. annuus an 
exceedingly strong infection was produced, numberless spermo¬ 
gonia appearing, followed by well developed aecidia in great 
quantity. The first sowings on H. mollis were made May 6, the 
first spermogonia appearing May 16, and the first aecidia May 22 
and 23. A second sowing was made May 29, giving spermogonia 
June 7, and aecidia June 16. The sowing on H. annuus was 
made June 2, showing spermogonia June 8, and aecidia June 17. 
Cultures of the Helianthus-rust were made during the pre¬ 
vious year's work, 0 employing spores from H. grosse-serratus, 
which were found to grow upon the same host and the similar 
H. Maximiliani, but not upon H. strumosus. Judging from the 
work of the two years, it appears possible to divide the Heli¬ 
anthus-rust into at least three series, for which the forms on H. 
mollis, H. strumosus and H. grosse-serratus may be taken as 
representatives respectively. Dr. E. Jacky 10 of Switzerland has 
made cultures, and has come to the conclusion that there are two 
species of Helianthus-rust, for which the names P. Helianthi 
Schw. and P. helianthorum Schw. are to be used. It seems to 
7 Jour. Mycol. 5:53. 1902. 
•Trans. Wis. Acad. Sci. 14:88 . 1903. 
9 Bot. Gaz. 35 AI. 1903. 
10 Centr. f. Bakt. p 2 :841. 1902. 
